Slotting machine



3 Sheets-Sheet 1.

w. J. HAGMAN "SLOTTING MACHINE- Fi'led June 27. 1921 Mar. 3,

" Mhr. 3, 1925. 1,528,150

' w. J. HAGMAN SLOTTING momma F i ie d Juneg'r, 19 21 3 Sheets-Sheet 2 Mar; 3', 1925.

. A v 1,528,150 w. J. HAGMAN SLOTTING mcnmn Filed June 27, 1921 3 Sheets-Skiet 5 Patented Mar. 3, 1925.

' UNITED-ii PATENT ore-i wan-An J. rmeenrteam rsmi rwma fiwNg o Nines: EMEN H N -Qmmm r IeW- Y R Yr, 4 commuter-O NEW J sa swarms Application meg n ne'av,

To aZZ whom it mayooncera a citizen of the United States, residing-at Philadelphia, in the county of Philadelphia and State of- Pennsylvanimihave invented certain new and useful Improvements in Slotting Machines, of Which the following is a specification.

This invent on relates to machine tools and particularly 'to slotteirs, niillers and like-machines of -the -general;type wherein the Work support comprises a'work table rotatably supported on a transversely movable slide in turnv supported on a saddle longitudinally movable on the bed of the machine, thetool being mounted on a column and extending over the table:

The principal object of the invention is to provide an improved machineof the general type stated wherein themechanism for operating the work supportingelements is removed from a position likely tointerfere. with the operator,means'being pro vided however at the hand of the operator for controlling'such mechanism,

It is anobjectoftheiinvention to provide in connection -with the machinejand the means for feeding thework supports, means for traversing the supports continuously, the} feeding andv traversing means preferably operating th-rou'ghthe same driving mechanism to move the supports,

Another objectof the invention is to provide in combination with the slotter cutter bar and the means for-varying the stroke of the same, improved means for directly indicating the stroke} to :which the first means is adjusted. 1: i

Viththese and other-objects in view, my invention consists in'the features of construction and'operation set forth in thefollowing specification and illustrated. in the accompanying drawings. In such' drawings annexed hereto and forming a part of this specification, I have shown my invention embodied in-a vertical crank slotter but it will be understood that. the invention can beotherwise embodied and that the drawings are notto be construed as defining or limiting the scope of the invention, ,the claims appended to'this specification being relied upon for that purpose.

Referring to the figures of the drawings:

"cutter bar.

1 921 sen rno. 480,841.

Figure 1 is a front. elevation of a vertical crank slotter bodied therein-.-

having the invention em- Fig. 2 is a fragmentary rear elevation of s the machine, portions 1 thereof being :shown in section.-

Fig 3 is a fragmentary front end elevation'of the machine,

oft-he machine, parts thereof being shown in section. I

Fig. :5 is a fragmentary sectional plan view taken on line -55 of Fig. 2.

Fig. 6 is an enlarged front elevation of the-crank mechanism for reciprocating the .Fig. 7 is-a sectional View thereof taken on line 7 7 of Fig. 6. i

Fig. 8 s an enlarged elevation of a scale I plate-and pointer for indicating the stroke of the cutter bar.

Fig. 9 is a fragmentary sectional View thereof taken on the line 9 9 of Fig. 8. T

Infslotters, vertical milling machines and rectilinearljni This means 1 commonly comprises a plurality of shaftsextending trans versely ofthe machine and provided with change gears at the ends thereof projecting outwardlyto a position at the front of the machine directly in the path of the-oper- "ator.

The provisionof such construction permits quick and easy change of the gears whereby the table may be rotated or moved rectilinearly but such arrangement forms an obstacle directly in the place Where the operator normally would stand in attending thema-chine. The presentf invention, among other improvements, provides means Whereby the gearing is placedatthe rear of the machlne ent rely out of the path of the operator, means being. provided however wvhereby the operator may control the same from his usual position at the front of the machine. In thei drawings, I have illust rated' such controlling means as compris- [mg clutches operated from clutch rods extending to the front of the machine.

Fig. 4 is a plan view of the lower portion other machines ,of the'geheral type defined above, means is ordinarily provided for either rotatinggthe table or moving. the same '89 tails shown therein. Other improvements comprising the invention and the specific mechanism illustrated in the drawings will now be described.

In the drawings, 1 indicates the bed and 2 the upright or column of a vertical crank slotter. A cutter bar 3 counter-balanced at 4 and operated from a motor 5 is guided for vertical reciprocation in the upright. Bolts 6 are provided for securing a tool or tools to the tool head 6 and the bar guide 7 may be adjusted vertically on the column by means of a screw 7 The cutter bar and head are vertically reciprocated from the motor 5 through gears 8, 9, 10, driving connections at 11, shaft 12, crank 13, and a link 14 operatively connected to the cutter bar Means is provided in connection with the crank 13 for varying the stroke of the cutter bar 3 and further and improved means is also preferably provided for indicating the length of the stroke of the cutter bar for the various adjustments of the crank mechanism. This mechanism comprises the crank disk 13 on the inner end of shaft- 12. A driver 16 connected to the link 14 is m0unted to slide radially in a guideway 17 in the disk. A screw 18 is journaled radially in the disk at 19 and is threaded at 20 to engage the driver. The screw is also preferably provided with a second finer thread 21 engaged by a threaded block 22 provided with a pointer 23 thereon adapted to move along a scale 24 secured to the disk. It will be noted. that the pitch of the threads are such that the driver and pointer move simultaneously as the screw is rotated, the arrangement being such that the pointer indicates directly on the scale the stroke imparted to the cutter bar 3 and head 6 for any adjustment of the crank mechanism. The screw is held against longitudinal movement in the disk by means of a collar 25 and a nut 25" thereon and may be rotated from a squared end portion 26 thereon.

The work support comprises a saddle 27 slidable longitudinally on ways 28 of the bed 1, a slide 2-9 transversely slidable on ways 30 of the saddle, and a work table 31 rotatably mounted on the slide. The saddle and slide are moved respectively by means of screws 32 and 33. The table is rotated from a shaft 34 having a worm 35 splined thereto and meshing with a worm wheel 36 on the work table. The screw shaft 33 and shaft 34 extend rearwardly parallel with the ways 30 on the saddle into a gear box 37 mounted on the saddle. The forward ends of shafts 33 and 34 are squared at 33 and 34 respectively whereby the same may be rotated by hand for fine adjustments. Shaft 33 may also be rotated from the squared ends of a shaft 33 connected to shaft 33 through spiral gears 33. Gears 37 and 38 driven from a gear 36 on a shaft 39 are loosely mounted respectively on shafts 33 and 34 within the gear box. Clutches 49 and 41 splined to shafts 33 and 34 are adapt ed to operatively connect either gear with its shaft. A yoke 42 engaging the clutches at its ends and pivoted at 43 is adapted to be operated by a clutch rod 44 pivoted to one end of the yoke at 44 and extending to the front of the machine whereby either shaft 33 or 34 may be thrown into operation to move the slide or to rotate the table. The shaft 39 carries a bevel gear 45 at its inner end which meshes with a like gear 46 splined to a shaft 47. Shaft 39 and gears 45 and 46 are rotatably supported on the saddle and move therewith along the shaft 47.

The feeding of the work supporting elements is preferably accomplished from the tool operating means as follows: A shaft 48 is oscillated from a cam 49 on shaft 12 through a lever 50 mounted on one end of the shaft and engaging the cam. A. second lever 51 on the forward end of shaft 48 is operatively connected by a link 52 to a disk The disk 53 is loosely mounted on the hub of a gear 54 keyed to a shaft 55 mounted in the bed. The shaft 55 is operatively connected to the shaft 47 through bevel gears 56 and 57 secured to such shafts respectively. Gear 54 is operativcly connected to the saddle screw 32 through a gear 58 keyed to a shaft 59, bevel gears 60 and 61 on shaft 59 and screw 32- respectively, and a clutch 62 splined to shaft 59. The gear 60 is loosely mounted on the shaft 59 and is connected thereto by means of the clutch 62. Gear 58 meshes directly with gear 54. In operation the oscillation of shaft 48 is transmitted to the disk 53 and from thence to the gear 54 and shaft 55 through a ratchet pawl mechanism 63 mounted on the disk and adapted to engage the teeth of gear 54 to drive the same intermittently in one direction. A handle 64 is provided on the pawl mechanism whereby the same may be held out of driving engagement relative to the gear 54 or may place the pawl mechanism to drive the gear 54 in. either direction. A clutch rod 65 has a yoke 66 thereon engaging the clutch 62 whereby the clutch may be shifted into or out of engagement with the bevel gear 60 which is loose on shaft 58.

The operation of the feed mechanism is as follows: To feed the saddle 27 the clutch 62 is placed in engagement with gear 60. The oscillation of the disk 53 will thus be transmitted to the screw 32 to feed the saddle. lVhen it is desired to feed the slide 29 or to rotate the table 31, the clutch 62 is disengaged from gear 60. The oscillations of disk 53 are transmitted through shaft 55 and the other mechanism described to the gears 37 and 38 on the screw shaft 33 and table operating shaft 34. The clutch yoke l2 may be 'operate'dfrom the" roddi lo 011-;

gage'eithe'r clutclrtt) or 41' with it'sgearfand thereby drive either the screw shaft: 333 0 1" shaft 34 "as desired. Theshd'e-is thereby moved on its Waysand the table rotated" from these shafts as heretofore described;-

Means comprising a gear 67 loosely mounted on shaft 47 is also preferably-1 provided for continuously.operating the saddle, slide and table shaftsto'efiecttra-versihgmove ment of the saddle, slide and table; I have illustrated a motor 68for' performing; this 7' function, gears 69, 7-0, shaft 71 'andgear. 72

providing an operative connection from the motor to the gear '67 Which gear maybe o p erated continuously therefrom when desirech A clutch 73 splined toshaft 474s adapted to be engaged with, gear 67 to operate the shaft 47 from; the motor 6S when-desiredi A clutch rod 74 engagesan arm='75 -of 'a clutch yoke 75 in engagement with-clirtclrTEl whereby the clutch" maybe-shiited sin't'o" or out of engagement with gear-'67 During this traversing operation, the pawl mechanism 63 is held in a neutral positions hat I claim is: 5 t I r 1. In ama-chine tool, the tombinat-ioncomprising a table, a slide for supportin-g said table, a set of gearingtor operating said slide and for rotating said tableg means-com prising aunitary member for" se'leotively con nectingsaid gearing'to the slide and to said table, and means forselectively operating said gearing intermittently and-continu- 'ously. p

2. In -a machine tool, the" combination comprising a table, transverselymovable slide for supportingsaid-table;- a: set-o-fgearing located at the rear of the mach ine for operating sald sllde and for rotating said table, means controlled from the fro'ntieo'f the machine for selectively connecting said gearing to the slide and to thetable, and means for operating said gearing to effect intermittent feeding movement of the slide and intermittent rotation of the table and means to effect continuous movement of the slide and continuous rotation of the table. 8. In a inachine tool, the combination comprising a table, a slide for supporting said table, a set of gearing located at'th'e rear of the machine for operating said {slide and for rotating saidtable, means-comprising. rod extending from said gearing to the frontof the machine'- for selectively connecting said gearing to the s1ide and the table, and means for selectively operating said gearing intermittently and: continuously. I r 7 4i; Ina machine-tool, the combination comprising a table, a transversely' mova'ble slide for supporting the table, a longitudinally movable saddlefor supportingsaidwslide, means comprising a set'of gearmgi located at the rear of the machine and controlled from the front thereof for intermittently ing said gearing to traverse said? slide and to continuously rotate: said table. a I

5. In a maeh-ine tool the'combinationlconn prising atable; a slide for! supporting said table," aset of gearing, t'woxcl'ntches for-com necting saidgearing' to operate said slide a-nd to rotate said table,- means. comprising a unitary member for operating saidiclutche's to selectivelyconnect the geaning to the slide and thetable, and-means ifor: selectively op erati ng said" gearing intermittently and con tinuously. 7 I

6. In a mach in'e tool, the combination comprising ayt'a-bl eg' a slide ton supporting said table; a set of' gearing =located'at the: rear of the machine, two clutches adapted to COIL- nect saidgearing to operate said; slide and to rotate said table, and means comprising a iiodextendingifromi the rear of :the'zmarchine to the front thereof for operating .said elutches to selectivelyconnect; the gearing to the slideand the table.

7. In a machi-ne tool, the combination; comrprising: atable a slide for supporting said table, aset of gearing locatedat the rear of the machine, tWo clutches-for: connecting said gearingi to operate said; slide and to rotate said table; means comprisingaa rod extending from the roan of the maehinehzto theuf-ront thereof forzopenating saidclntohesit-o selecv i ng said gearing intermittently and continu- Tou'sly.

8; In a machinetooltthe combination comprising' a table; a slide: for supporting said table,- a, set of gearing .lo'catedtat the rear of the machine two clutches-forconneotingsaid gearingto operate said: slide; and to rotate said table,ra yokelmemberfor operating saida clutches; and means com-prisingua rod extendingfrom therrea'rof the machine ;to the: front thereof. for operating said yoke member to selectively connect the gearing to the slidev and the. table;

9. In a machinettool, the combinationcomprising-ta'worlr table, a shaftafor efiecting rotative =movemen't ofthe table, a second shtft fOl." effecting: linear movement of the table, a set of gearing'located at the rear fot the. machine for operating: said shafts, and meanszcomprising a: rod extending from said gearing to-the frontofthe-m-achine for-selectivelyconnecting said gearing to said shafts.

10. In a machine: tool," the combination comprisinga Work table,-a shaft-for effectingrotative movement of the: table, asecond shaft -for eflecting, linear movement of the table, a 'set'of gearing located at the rear of the machine for operatingsaid shafts, means comprising a;riod extending from said gear ing-rto the -frmit ofthe, machine for selecrotative movement of the table, a secondshaft for effecting linear movement of the table, a set of gearing located at the rear of the machine, two clutches for connecting said gearing to said shafts, a yoke member for operating said clutches, and means comprising a rod extending from the rear to the front of the machine for operating said yoke member to selectively effect operation of said shafts.

12. In a machine tool, the combination comprising a work table, a shaft for effecting rotative movement of the table, a second shaft for effecting linear movement of the table, a set of gearing located at the rear of the machine, two clutches for connecting said gearing to said shafts, a yoke member for operating said clutches, means comprising a rod extending from the rear to the front of the machine for operating said yoke member to selectively effect operation of said shafts, and means for selectively ope-ating said gearing intermittently and continuously.

13. A machine tool comprising the combination of a bed, an upright thereon, tool supporting means on the upright, tool operating means, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably mounted ,on the slide, a screw for moving the saddle longitudinally, a second screw for moving the slide transversely, a shaft extending parallel with the said second screw and operativelyv connected to the table for rotating the same, gearing at the rear of the machine for operating the shaft and second screw, means for operating the saddle screw and the said gearing for feeding the saddle, slide and table, and means extending from the said gearing to the front of the machine for selectively connecting the second screw and the shaft with the feeding means.

14. A machine tool comprising the. combination of a bed, an upright thereon, tool supporting means on the upright, tool operating means, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably mounted on the slide, a. screw for moving the saddle longitudinally, a second screw for moving the slide transversely, a shaft extending parallel with the said second screw and operatively connected to the table for rotating the same, gearing at the rear of the machine for operating the shaft and second screw, means for operating the saddle screw and the said gearing for feeding the saddle, slide and table, a clutch operating rod extending from the said gearing to the front of the machine for selectively connecting the second screw and the shaft wit-h the feeding means, and means at the front of the machine for connecting the saddle screw with the said feeding means.

15. A machine tool comprising the combination of a bed, an upright thereon, tool supporting means on the upright, tool oper ating means, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably 1nounted on the slide, a screw for moving the saddle longitudinally, a second screw for moving the slide transversely, a shaft extending parallel with the said second screw and operatively connected to the table for rotating the same, gearing at the rear of the machine for operating the shaft and second screw, means for operating the saddle screw and the Said gearing for feeding the saddle, slide and table, a clutch operating rod ex tending from the said gearing to the front of the machine for selectively connecting the second screw and the shaft with the feeding means, means at the front of the machine for connecting the saddle screw with the feeding means, and means whereby the saddle and slide may be traversed and the table continuously rotated.

16. A machine tool comprising the combination of a bed, an upright thereon, tool supporting means on the upright, tool operating means, a saddle longitudinally slidable on the bed, a. slide transversely slidable on the saddle, a work table rotatably mounted on the slide, a screw for moving the saddle longitudinally, asecond screw for moving the slide transversely, a shaft extending parallel with the said second screw and operatively connected to the table for rotating the same, gearing at the rear of the machine for operating the shaft and second screw, means for operating the saddle screw and the said gearing for feeding the saddle, slide and table, a clutch element on the second screw, a clutch element on the shaft, pivoted means operatively connected to each clutch element, a rod connected to the pivot ed means and extending to the front of the machine whereby the operator may connect either the second screw or the shaft with the feeding means, means at. the front of the machine for connecting the saddle screw with the feeding means and means operative through the feeding connections whereby the saddle and slide may be traversed and the table continuously rotated.

717. A machine tool comprising the combination of a bed, an upright thereon, tool supporting means on the upright, tool operating means, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably mounted on the slide, a screw for moving the saddle longitudinally, a second screw for moving v on the slide.,;.a screw for rnoyingfghe-saddl for KIIHQVLDDL the slide;transitei'sely, a shaftgextending mounted-on,the slide a screwifor moving parallel with the said second screw {andoper atively connectechto the, {table 1 for. rotating thesame, --a secon-d shaft;extending; parallel,, 1 V

' screw andoperatively conneetedto the table for rotating the same gearing at ,the near.

withv the bed, .Ii --=inc l re ee-r als p r yc ne ngthese ond haft w th the first named shaftr, and, -second; .@screw, means for ope zatlng -the,,second ,shaft inten mittently and continuously, and means com: prising a unitary I nemhen, at the gfl'QIll} of the; machine ,for: selectively connecting ;-he second screw l and, the gfirst shaft, with; the; second shaft.

18., A slotter comprising thecOInhinatiOn f,- of a 1 bed, an ,upright thereon, a tooLsupporh-g s h a m iui ediq %'V -.Zl'z WiP QQ P QIl': on the-upright,- power gmeflns:for-reciprocat ing the head, a saddle flongitudinally;slidable on the, bed, slide transyerselyslidable on the-saddle, awork table rotatably monntede gitud ally, a econd ,tscrei the SllClQf,tIdlEYQWQlYM is attre te i l i p r llel with the sa d second-s tewa d9P6! atively-v connected to the; table, for i rotatin thesame, gearing a th re r f themaeh n for operating, the, shaft; and second; ,scr ew means including ,the; said gearing for opellatively connecting thegshi fft and ,screwswith,

the said power means for feedingthe saddle,

slide and table, ;and =,meansextending from the said gearing vto the: frontiof the machine for selectively: connecting1 the :secOnd: screw 1 and the shaft with; the feedingggmeans,

19. 'A' slotter comprising; the combination 1 of a 'bed an uprightathereon, a tool support-g,

the .slidetransversely, 3, shaft extending parallel with the said second screwand ope. 1.

eratively connected to the table forrrotating the same, gearingat theilrear, ofthe ma-,,; chine for. operating. the-shaft andnsecond, screw, means including the said gearingqfors operatively connecting the shaftand screws with the said powermeans for feedingzlthepn saddle, slide and: table,,. a clutch operating rod extending from the said gearing to the front of the machine for selectively conmeeting the second screw and the shaft with the feeding means, and means at the frontof the machine for connecting the saddle screw with the said feeding means.

20.. A slotter comprising the combination of a bed, an upright thereon, a tool supporting head mounted for vertical reciprocation on the upright, power means for reciprocating the head, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably the. saddle;longitudinally, a secondvscrew,

of the machine; for operating, the shaft and second @screw, means including the said gear,-

ing. for operatively-connecting the shaft and ascrews with the ,said ,power. means for; feed-c, ring, the saddleslid a d efa l tch: P- weratfmg rod extending from thesaid gearing v to the, front ,of the machine; for selectively,

'connecting the,,second; screw. andthe, shaft c h; ha1fe l g means, m nsa th o t ersed and-dhe ;table a continuously rot-ated.

firsttshaft, gearing; atathe rear of the ma-, chine donoperatively ,connecting the second bed '..;andoperatively 1 connected with; the

second shaft, means for/operating the third sha-ft rintermittently and continuously, and

means extending-(from athe, said-igea-ring to the front; of the machine ,for; selectively" .connectingthe sec0-I1 d,,screw.,and the first shaft withthe second. and third shafts;

22.1%. slotter comprising,the combination p of a 'bednan upright thereon,- a tool support- A ott ne mrrisii athe s mb at a-b d, aanrri h l-tl eteoala o l s pp rtah a-d meilntedife i tiea cipro a on, -the nn iehtapovv mans t vr rro a g.\ t e; h ads a dd l ng tu ina y s v .ta le enthe bed, as d t isr e ri l d le-- ;:on I the ,saddlep a ,work table; rotatably mounted. on the slide, .a screw f0r-;,mo.ving -the, saddle, longitudinally; a --second screw for moving the;- vversely, a s aft e nding. ip r lleltywith the said second screw and operatively colr, nested toithe table f r tati g the s me, ,a

,secondm shaft 1 extending parallel ,witlrthe;

slide trans- --screw with the feedin-g means and, means. :wherebyqthe saddle and.- sl-1de,;may,be tray- H p shaft with; thegfirst shaft and secondscrew, 111g-'l1e21Cl..mO1lI1t8CbZEOI'JVBItlQELLIBClPIQOELlElOD, :a third; shaft, t di I P 1 11 1, ith th on the uprightypower; means"; for I recipro'cat.-, w

.ing headmounted-for vertical reciprocation 1 @on the upright; ipower :means, for: reciprocat ing the-:head, --a saddle longitudinally slid- 1 able on .the bed,.a slide transversely slidalole;

onithei saddles a work-tablet.-rotatahly mountedio'ntheslide ia screw, forgmoving 1 I the saddle longitudinally, a second screw for moving the slide transversely, a shaft extending. parallel with. the said second screw and operatively connected to the table for rotating the-same, a second shaft eX- tending parallel with the bed, means including gearing for operatively connecting the second shaft with the first named shaft and second screw, means for operating the second shaft intermittently from the said power means, means for operating the second shaft continuously, clutch mean's operati e from t e front Qtth h n r connecting either of such means to the second shaft, and means comprising a unitary member at the front of the machine for selectively connecting the second screw and the first shaft with the second shaft.

23. A slotter comprising the combination of a bed, an upright thereon, a tool supporting head mounted for vertical reciprocation on the upright, an electric motor for reciprocating the head, a saddle longitudinally slidable on the bed, a slide transversely slidable on the saddle, a work table rotatably mounted on the slide, a screw for moving the saddle longitudinally, a second screw for moving the slide transversely, a shaft extending parallel with the said second screw and operatively connected to the table for rotating the same, a second shaft extending parallel with the bed, means including gearing for operatively connecting the second shaft with the first named shaft and second screw, a second electric motor, means operative between one of the motors and the second shaft for operating the same intermittently synchronously with the reciprocation of the head, means whereby the second shaft.

may be operated continuously from the second motor, and means at the front of the machine whereby the operator may connect either the second screw or the first shaft with the second shaft.

24. A stroke indicator comprising the combination of a rotary element, a screw mounted radially therein, a driver mounted in the element in threaded engagement with the screw and adapted to be adjusted radially of the element as the screw is rotated, a stroke indicating element in threaded engagement with the screw, and a scale along which the indicating element is adapted to travel as the screw is rotated.

25. A stroke indicator comprising the combination of a rotary element, a screw mounted radially therein and having relatively fine and coarse threads out respectively therein on different portions of its length, a driver mounted in the element in engagement with the coarse thread and adapted to be adjusted radially of the element as the screw is rotated, a stroke indicating element in threaded engagement with the fine thread of the screw, and a scale along which the indicating element is adapted to travel as the screw is rotated.

26. A stroke indicator comprising the combination of a rotary element, a screw j ournaled radially therein, the screw having a fine thread cut therein adjacent the journaled portion thereof and a relatively coarse thread cut on another portion thereof, a driver mounted in the element in engagement with the coarse thread and adapted to be adjusted radially of the element as the screw is rotated, a stroke indicating element in threaded engagement with the fine thread and adapted to slide radially in the journaled portion of the rotary element, and a scale on the rotary element along which the indicating element is adapted to travel as the screw is rotated.

27.111 a slotter, the combination of a recipro-catory tool head, a rotary element, a driver mounted in the rotary element and operatively connected to the head to reciprocate the same, means on the rotary element engaging the driver and adapted to adjust the driver radially of the rotary element to vary the stroke of the head, stroke indicating means comprising a pointer connected to the first named means and movable on the rotary element, and a scale on the rotary element along which the pointer is adapted to travel, the several parts being so related that the pointer definitely indicates the rec tilinear stroke of the head on the scale.

28. In a slotter, the combination of a re ciprocatory tool head, a rotary element, a driver mounted in the rotary element and operatively connected to the head, a screw rotatably and radially mounted in the rotary element in threaded engagement with the driver for adjusting the same radially of the rotary element to vary the stroke of the head, a scale indicating means threadedly engaging the screw and comprising a pointer, and a scale on the rotary element along which the pointer is adapted to travel as the screw is rotated, the several parts be ing so related that the pointer definitely indicates the rectilinear stroke of the head on the scale.

In testimony whereof, I hereto afiix my signature.

WILLIAM J HAGMAN. 

